Parse JSON

Compute the total amount of non-canceled external USD transactions from a stream of JSON records as fast as possible.

Input: 1 000 000 JSON records on STDIN, one per line. Each record has the following structure:

{
    "user_id": 0,
    "currency": "USD",
    "transactions": [
        {
            "amount": 0,
            "to_user_id": 0,
            "canceled": false
        }
    ]
}

Field	Constraints
`user_id`	Integer, max 10 000
`currency`	One of `"GBP"`, `"USD"`, `"RUB"`, `"JPY"`, `"CHF"`
`transactions`	Array, max 10 elements
`amount`	Integer, max 1000
`canceled`	Boolean; may be omitted when `false`

Field order is not guaranteed within any object.

Output: The total amount of all transactions where:

record.currency == "USD"
transaction.to_user_id != record.user_id (external)
transaction.canceled is false or absent

Restrictions:60s512Mb 1 Score Packages

Feel free to create an issue if you need an extra library from the standard Ubuntu repository.

Name	Version	Description
libc6-dev	2.39-0ubuntu8.7	GNU C Library: Development Libraries and Header Files Contains the symlinks, headers, and object files needed to compile and link programs which use the standard C library.
libclang-common-14-dev	1:14.0.6-19build4	Clang library - Common development package Clang project is a C, C++, Objective C and Objective C++ front-end based on the LLVM compiler. Its goal is to offer a replacement to the GNU Compiler Collection (GCC). . Clang implements all of the ISO C++ 1998, 11, 14 and 17 standards and also provides most of the support of C++20. . This package contains the Clang generic headers.
libclang-common-15-dev	1:15.0.7-14build3	Clang library - Common development package Clang project is a C, C++, Objective C and Objective C++ front-end based on the LLVM compiler. Its goal is to offer a replacement to the GNU Compiler Collection (GCC). . Clang implements all of the ISO C++ 1998, 11, 14 and 17 standards and also provides most of the support of C++20. . This package contains the Clang generic headers.
libclang-common-16-dev	1:16.0.6-23ubuntu4	Clang library - Common development package Clang project is a C, C++, Objective C and Objective C++ front-end based on the LLVM compiler. Its goal is to offer a replacement to the GNU Compiler Collection (GCC). . Clang implements all of the ISO C++ 1998, 11, 14 and 17 standards and also provides most of the support of C++20. . This package contains the Clang generic headers.
libclang-common-17-dev	1:17.0.6-9ubuntu1	Clang library - Common development package Clang project is a C, C++, Objective C and Objective C++ front-end based on the LLVM compiler. Its goal is to offer a replacement to the GNU Compiler Collection (GCC). . Clang implements all of the ISO C++ 1998, 11, 14 and 17 standards and also provides most of the support of C++20. . This package contains the Clang generic headers.
libclang-common-18-dev	1:18.1.3-1ubuntu1	Clang library - Common development package Clang project is a C, C++, Objective C and Objective C++ front-end based on the LLVM compiler. Its goal is to offer a replacement to the GNU Compiler Collection (GCC). . Clang implements all of the ISO C++ 1998, 11, 14 and 17 standards and also provides most of the support of C++20. . This package contains the Clang generic headers.
libclang-common-19-dev	1:19.1.1-1ubuntu1~24.04.2	Clang library - Common development package Clang project is a C, C++, Objective C and Objective C++ front-end based on the LLVM compiler. Its goal is to offer a replacement to the GNU Compiler Collection (GCC). . Clang implements all of the ISO C++ 1998, 11, 14 and 17 standards and also provides most of the support of C++20. . This package contains the Clang generic headers.
libclang-common-20-dev	1:20.1.2-0ubuntu1~24.04.2	Clang library - Common development package Clang project is a C, C++, Objective C and Objective C++ front-end based on the LLVM compiler. Its goal is to offer a replacement to the GNU Compiler Collection (GCC). . Clang implements all of the ISO C++ 1998, 11, 14 and 17 standards and also provides most of the support of C++20. . This package contains the Clang generic headers.
libcrypt-dev	1:4.4.36-4build1	libcrypt development files This package contains the files needed for developing applications that use libcrypt.
libgcc-10-dev	10.5.0-4ubuntu2.1	GCC support library (development files) This package contains the headers and static library files necessary for building C programs which use libgcc, libgomp, libquadmath, libssp or libitm.
libgcc-11-dev	11.5.0-1ubuntu1~24.04.1	GCC support library (development files) This package contains the headers and static library files necessary for building C programs which use libgcc, libgomp, libquadmath, libssp or libitm.
libgcc-12-dev	12.4.0-2ubuntu1~24.04.1	GCC support library (development files) This package contains the headers and static library files necessary for building C programs which use libgcc, libgomp, libquadmath, libssp or libitm.
libgcc-13-dev	13.3.0-6ubuntu2~24.04.1	GCC support library (development files) This package contains the headers and static library files necessary for building C programs which use libgcc, libgomp, libquadmath, libssp or libitm.
libgcc-14-dev	14.2.0-4ubuntu2~24.04.1	GCC support library (development files) This package contains the headers and static library files necessary for building C programs which use libgcc, libgomp, libquadmath, libssp or libitm.
libobjc-13-dev	13.3.0-6ubuntu2~24.04.1	Runtime library for GNU Objective-C applications (development files) This package contains the headers and static library files needed to build GNU ObjC applications.
libssl-dev	3.0.13-0ubuntu3.9	Secure Sockets Layer toolkit - development files This package is part of the OpenSSL project's implementation of the SSL and TLS cryptographic protocols for secure communication over the Internet. . It contains development libraries, header files, and manpages for libssl and libcrypto.
libstdc++-10-dev	10.5.0-4ubuntu2.1	GNU Standard C++ Library v3 (development files) This package contains the headers and static library files necessary for building C++ programs which use libstdc++. . libstdc++-v3 is a complete rewrite from the previous libstdc++-v2, which was included up to g++-2.95. The first version of libstdc++-v3 appeared in g++-3.0.
libstdc++-11-dev	11.5.0-1ubuntu1~24.04.1	GNU Standard C++ Library v3 (development files) This package contains the headers and static library files necessary for building C++ programs which use libstdc++. . libstdc++-v3 is a complete rewrite from the previous libstdc++-v2, which was included up to g++-2.95. The first version of libstdc++-v3 appeared in g++-3.0.
libstdc++-12-dev	12.4.0-2ubuntu1~24.04.1	GNU Standard C++ Library v3 (development files) This package contains the headers and static library files necessary for building C++ programs which use libstdc++. . libstdc++-v3 is a complete rewrite from the previous libstdc++-v2, which was included up to g++-2.95. The first version of libstdc++-v3 appeared in g++-3.0.
libstdc++-13-dev	13.3.0-6ubuntu2~24.04.1	GNU Standard C++ Library v3 (development files) This package contains the headers and static library files necessary for building C++ programs which use libstdc++. . libstdc++-v3 is a complete rewrite from the previous libstdc++-v2, which was included up to g++-2.95. The first version of libstdc++-v3 appeared in g++-3.0.
libstdc++-14-dev	14.2.0-4ubuntu2~24.04.1	GNU Standard C++ Library v3 (development files) This package contains the headers and static library files necessary for building C++ programs which use libstdc++. . libstdc++-v3 is a complete rewrite from the previous libstdc++-v2, which was included up to g++-2.95. The first version of libstdc++-v3 appeared in g++-3.0.
libtbb-dev	2021.11.0-2ubuntu2	parallelism library for C++ - development files TBB is a library that helps you leverage multi-core processor performance without having to be a threading expert. It represents a higher-level, task-based parallelism that abstracts platform details and threading mechanism for performance and scalability. . (Note: if you are a user of the i386 architecture, i.e., 32-bit Intel or compatible hardware, this package only supports Pentium4-compatible and higher processors.) . This package includes the TBB development files.

Back to listMar 20, 2026 03:23

Yuriy Lyfenko

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Challenge History

Date	Challenger	Cost	Type	Status
May 17, 2026 14:15	M-Rochat	10.00	Custom	Solution Broken

Run Statistics

#	Date	Score	Wall Time	CPU User	CPU System	Memory	Error
1	May 17, 2026 14:34	0	60,060,542,150	60,050,507,000	1,000,000	16,384	Killed by timeout
2	Mar 20, 2026 03:23	3,213	52,640,535	34,333,000	1,009,000	2,269,184
3	Mar 20, 2026 03:24	3,223	58,809,429	34,444,000	1,013,000	2,269,184
4	Mar 20, 2026 03:24	3,223	58,200,727	34,437,000	1,012,000	2,437,120
5	Mar 20, 2026 03:24	3,223	60,443,309	34,437,000	1,012,000	2,531,328
6	Mar 20, 2026 03:32	3,224	61,118,572	34,455,000	1,013,000	2,531,328
7	Mar 20, 2026 03:23	3,225	67,847,510	34,463,000	1,013,000	2,269,184
8	Mar 20, 2026 03:32	3,226	56,373,556	34,475,000	1,013,000	2,531,328
9	Mar 20, 2026 03:32	3,226	54,763,723	34,473,000	1,013,000	2,531,328
10	Mar 20, 2026 03:32	3,226	59,568,243	34,472,000	1,013,000	2,445,312
11	Mar 20, 2026 03:24	3,226	59,191,264	34,475,000	1,013,000	2,531,328
12	Mar 20, 2026 03:24	3,226	53,725,414	34,474,000	1,013,000	2,531,328
13	Mar 20, 2026 03:23	3,226	60,701,088	34,468,000	1,013,000	2,437,120
14	Mar 20, 2026 03:24	3,227	58,070,029	34,483,000	1,014,000	2,531,328
15	Mar 20, 2026 03:24	3,227	59,837,710	34,483,000	1,014,000	2,531,328
16	Mar 20, 2026 03:23	3,227	53,949,719	34,478,000	1,014,000	2,437,120
17	Mar 20, 2026 03:24	3,229	60,953,438	34,503,000	1,014,000	2,269,184
18	Mar 20, 2026 03:24	3,229	56,547,286	34,500,000	1,014,000	2,269,184
19	Mar 20, 2026 03:24	3,229	56,065,223	34,503,000	1,014,000	2,269,184
20	Mar 20, 2026 03:32	3,230	62,999,271	34,519,000	1,015,000	2,531,328
21	Mar 20, 2026 03:24	3,230	58,478,386	34,520,000	1,015,000	2,269,184
22	Mar 20, 2026 03:23	3,231	60,428,877	34,529,000	1,015,000	2,527,232
23	Mar 20, 2026 03:23	3,232	59,061,123	34,535,000	1,015,000	2,531,328
24	Mar 20, 2026 03:24	3,232	58,927,147	34,540,000	1,015,000	2,531,328
25	Mar 20, 2026 03:24	3,233	65,693,739	34,547,000	1,016,000	2,531,328
26	Mar 20, 2026 03:24	3,234	64,058,538	34,559,000	1,016,000	2,269,184
27	Mar 20, 2026 03:32	3,235	60,707,684	34,572,000	1,016,000	2,445,312
28	Mar 20, 2026 03:32	3,236	63,094,481	34,576,000	1,016,000	2,527,232
29	Mar 20, 2026 03:23	3,236	66,661,795	34,577,000	1,016,000	2,531,328
30	Mar 20, 2026 03:23	3,237	68,251,409	34,592,000	1,017,000	2,531,328
31	Mar 20, 2026 03:32	3,238	57,250,359	34,599,000	1,017,000	2,531,328
32	Mar 20, 2026 03:24	3,239	58,676,647	34,616,000	1,018,000	2,531,328
33	Mar 20, 2026 03:32	3,240	61,530,288	34,622,000	1,018,000	2,531,328
34	Mar 20, 2026 03:24	3,241	66,598,457	34,633,000	1,018,000	2,531,328
35	Mar 20, 2026 03:24	3,241	60,895,491	34,633,000	1,018,000	2,531,328
36	Mar 20, 2026 03:24	3,243	66,302,687	34,655,000	1,019,000	2,437,120
37	Mar 20, 2026 03:23	3,246	59,634,975	34,689,000	1,020,000	2,269,184

Model	Intel(R) Xeon(R) CPU E3-1271 v3 @ 3.60GHz
Cores	1